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19. PROPERTY, PLANT AND EQUIPMENT (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E R$ 2,450 R$ 2,662 R$ 2,762 R$ 3,775
Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 2,317 2,542 2,656 279
Investment Property Under Construction or Development [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 133 120 106 138
Land [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 229 [1] 215 [1] 211 [1] 3,637
Furniture and Utensils [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 3 4 3  
Reservoirs Dams and Water Courses [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 1,080 1,150 1,234 1,761
Buildings Works and Improvements [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 274 314 3 3
Machinery and Equipment [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 729 854 874 1,172
Vehicles [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 2 5 R$ 3 R$ 4
Gross Carrying Amount [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 7,385 7,568    
Gross Carrying Amount [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 7,252 7,448    
Gross Carrying Amount [Member] | Investment Property Under Construction or Development [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 133 120    
Gross Carrying Amount [Member] | Land [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 248 231    
Gross Carrying Amount [Member] | Furniture and Utensils [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 14 16    
Gross Carrying Amount [Member] | Reservoirs Dams and Water Courses [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 3,280 3,282    
Gross Carrying Amount [Member] | Buildings Works and Improvements [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 1,092 1,114    
Gross Carrying Amount [Member] | Machinery and Equipment [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 2,598 2,773    
Gross Carrying Amount [Member] | Vehicles [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E 20 32    
Accumulated Depreciation and Amortisation [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (4,935) (4,906)    
Accumulated Depreciation and Amortisation [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (4,935) (4,906)    
Accumulated Depreciation and Amortisation [Member] | Land [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (19) (16)    
Accumulated Depreciation and Amortisation [Member] | Furniture and Utensils [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (11) (12)    
Accumulated Depreciation and Amortisation [Member] | Reservoirs Dams and Water Courses [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (2,200) (2,132)    
Accumulated Depreciation and Amortisation [Member] | Buildings Works and Improvements [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (818) (800)    
Accumulated Depreciation and Amortisation [Member] | Machinery and Equipment [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E (1,869) (1,919)    
Accumulated Depreciation and Amortisation [Member] | Vehicles [Member] | Investment Property Completed [Member]        
Disclosure of detailed information about property, plant and equipment [line items]        
Net PP&E R$ (18) R$ (27)    
[1] Certain land sites linked to concession contracts and without provision for reimbursement are amortized in accordance with the period of the concession.